27/03/2023: Viết đặc tả usecase Thêm model

[kiet2709]

Hoàn thành task Link document: https://docs.google.com/document/d/1DMlDmfX0aQiRHhLzyBD_4aHsGZTMb0-A/edit?usp=sharing&ouid=112692646401533875846&rtpof=true&sd=true